diff options
Diffstat (limited to 'src/main/java/com/kitfox/svg/SVGUniverse.java')
| -rw-r--r-- | src/main/java/com/kitfox/svg/SVGUniverse.java | 533 |
1 files changed, 533 insertions, 0 deletions
diff --git a/src/main/java/com/kitfox/svg/SVGUniverse.java b/src/main/java/com/kitfox/svg/SVGUniverse.java new file mode 100644 index 0000000..48d0f3a --- /dev/null +++ b/src/main/java/com/kitfox/svg/SVGUniverse.java @@ -0,0 +1,533 @@ +/*
+ * SVGUniverse.java
+ *
+ *
+ * The Salamander Project - 2D and 3D graphics libraries in Java
+ * Copyright (C) 2004 Mark McKay
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Mark McKay can be contacted at mark@kitfox.com. Salamander and other
+ * projects can be found at http://www.kitfox.com
+ *
+ * Created on February 18, 2004, 11:43 PM
+ */
+
+package com.kitfox.svg;
+
+import com.kitfox.svg.app.beans.SVGIcon;
+import java.awt.Graphics2D;
+import java.net.*;
+import java.awt.image.*;
+import javax.imageio.*;
+import java.beans.*;
+import java.lang.ref.*;
+//import java.util.*;
+//import java.util.regex.*;
+
+import java.util.*;
+import java.io.*;
+import org.xml.sax.*;
+import javax.xml.parsers.SAXParserFactory;
+import javax.xml.parsers.SAXParser;
+import org.xml.sax.helpers.XMLReaderFactory;
+
+/**
+ * Many SVG files can be loaded at one time. These files will quite likely
+ * need to reference one another. The SVG universe provides a container for
+ * all these files and the means for them to relate to each other.
+ *
+ * @author Mark McKay
+ * @author <a href="mailto:mark@kitfox.com">Mark McKay</a>
+ */
+public class SVGUniverse implements Serializable
+{
+ public static final long serialVersionUID = 0;
+
+ transient private PropertyChangeSupport changes = new PropertyChangeSupport(this);
+
+ /**
+ * Maps document URIs to their loaded SVG diagrams. Note that URIs for
+ * documents loaded from URLs will reflect their URLs and URIs for documents
+ * initiated from streams will have the scheme <i>svgSalamander</i>.
+ */
+ final HashMap loadedDocs = new HashMap();
+
+ final HashMap loadedFonts = new HashMap();
+
+ final HashMap loadedImages = new HashMap();
+
+ public static final String INPUTSTREAM_SCHEME = "svgSalamander";
+
+ /**
+ * Current time in this universe. Used for resolving attributes that
+ * are influenced by track information. Time is in milliseconds. Time
+ * 0 coresponds to the time of 0 in each member diagram.
+ */
+ protected double curTime = 0.0;
+
+ private boolean verbose = false;
+
+ /** Creates a new instance of SVGUniverse */
+ public SVGUniverse()
+ {
+ }
+
+ public void addPropertyChangeListener(PropertyChangeListener l)
+ {
+ changes.addPropertyChangeListener(l);
+ }
+
+ public void removePropertyChangeListener(PropertyChangeListener l)
+ {
+ changes.removePropertyChangeListener(l);
+ }
+
+ /**
+ * Release all loaded SVG document from memory
+ */
+ public void clear()
+ {
+ loadedDocs.clear();
+ loadedFonts.clear();
+ loadedImages.clear();
+ }
+
+ /**
+ * Returns the current animation time in milliseconds.
+ */
+ public double getCurTime()
+ {
+ return curTime;
+ }
+
+ public void setCurTime(double curTime)
+ {
+ double oldTime = this.curTime;
+ this.curTime = curTime;
+ changes.firePropertyChange("curTime", new Double(oldTime), new Double(curTime));
+ }
+
+ /**
+ * Updates all time influenced style and presentation attributes in all SVG
+ * documents in this universe.
+ */
+ public void updateTime() throws SVGException
+ {
+ for (Iterator it = loadedDocs.values().iterator(); it.hasNext();)
+ {
+ SVGDiagram dia = (SVGDiagram)it.next();
+ dia.updateTime(curTime);
+ }
+ }
+
+ /**
+ * Called by the Font element to let the universe know that a font has been
+ * loaded and is available.
+ */
+ void registerFont(Font font)
+ {
+ loadedFonts.put(font.getFontFace().getFontFamily(), font);
+ }
+
+ public Font getDefaultFont()
+ {
+ for (Iterator it = loadedFonts.values().iterator(); it.hasNext();)
+ {
+ return (Font)it.next();
+ }
+ return null;
+ }
+
+ public Font getFont(String fontName)
+ {
+ return (Font)loadedFonts.get(fontName);
+ }
+
+ void registerImage(URL imageURL)
+ {
+ if (loadedImages.containsKey(imageURL)) return;
+
+ SoftReference ref;
+ try
+ {
+ String fileName = imageURL.getFile();
+ if (".svg".equals(fileName.substring(fileName.length() - 4).toLowerCase()))
+ {
+ SVGIcon icon = new SVGIcon();
+ icon.setSvgURI(imageURL.toURI());
+
+ BufferedImage img = new BufferedImage(icon.getIconWidth(), icon.getIconHeight(), BufferedImage.TYPE_INT_ARGB);
+ Graphics2D g = img.createGraphics();
+ icon.paintIcon(null, g, 0, 0);
+ g.dispose();
+ ref = new SoftReference(img);
+ }
+ else
+ {
+ BufferedImage img = ImageIO.read(imageURL);
+ ref = new SoftReference(img);
+ }
+ loadedImages.put(imageURL, ref);
+ }
+ catch (Exception e)
+ {
+ System.err.println("Could not load image: " + imageURL);
+ e.printStackTrace();
+ }
+ }
+
+ BufferedImage getImage(URL imageURL)
+ {
+ SoftReference ref = (SoftReference)loadedImages.get(imageURL);
+ if (ref == null) return null;
+
+ BufferedImage img = (BufferedImage)ref.get();
+ //If image was cleared from memory, reload it
+ if (img == null)
+ {
+ try
+ {
+ img = ImageIO.read(imageURL);
+ }
+ catch (Exception e)
+ { e.printStackTrace(); }
+ ref = new SoftReference(img);
+ loadedImages.put(imageURL, ref);
+ }
+
+ return img;
+ }
+
+ /**
+ * Returns the element of the document at the given URI. If the document
+ * is not already loaded, it will be.
+ */
+ public SVGElement getElement(URI path)
+ {
+ return getElement(path, true);
+ }
+
+ public SVGElement getElement(URL path)
+ {
+ try
+ {
+ URI uri = new URI(path.toString());
+ return getElement(uri, true);
+ }
+ catch (Exception e)
+ {
+ e.printStackTrace();
+ }
+ return null;
+ }
+
+ /**
+ * Looks up a href within our universe. If the href refers to a document that
+ * is not loaded, it will be loaded. The URL #target will then be checked
+ * against the SVG diagram's index and the coresponding element returned.
+ * If there is no coresponding index, null is returned.
+ */
+ public SVGElement getElement(URI path, boolean loadIfAbsent)
+ {
+ try
+ {
+ //Strip fragment from URI
+ URI xmlBase = new URI(path.getScheme(), path.getSchemeSpecificPart(), null);
+
+ SVGDiagram dia = (SVGDiagram)loadedDocs.get(xmlBase);
+ if (dia == null && loadIfAbsent)
+ {
+//System.err.println("SVGUnivserse: " + xmlBase.toString());
+//javax.swing.JOptionPane.showMessageDialog(null, xmlBase.toString());
+ URL url = xmlBase.toURL();
+
+ loadSVG(url, false);
+ dia = (SVGDiagram)loadedDocs.get(xmlBase);
+ if (dia == null) return null;
+ }
+
+ String fragment = path.getFragment();
+ return fragment == null ? dia.getRoot() : dia.getElement(fragment);
+ }
+ catch (Exception e)
+ {
+ e.printStackTrace();
+ return null;
+ }
+ }
+
+ public SVGDiagram getDiagram(URI xmlBase)
+ {
+ return getDiagram(xmlBase, true);
+ }
+
+ /**
+ * Returns the diagram that has been loaded from this root. If diagram is
+ * not already loaded, returns null.
+ */
+ public SVGDiagram getDiagram(URI xmlBase, boolean loadIfAbsent)
+ {
+ if (xmlBase == null) return null;
+
+ SVGDiagram dia = (SVGDiagram)loadedDocs.get(xmlBase);
+ if (dia != null || !loadIfAbsent) return dia;
+
+ //Load missing diagram
+ try
+ {
+ URL url = xmlBase.toURL();
+
+ loadSVG(url, false);
+ dia = (SVGDiagram)loadedDocs.get(xmlBase);
+ return dia;
+ }
+ catch (Exception e)
+ {
+ e.printStackTrace();
+ }
+
+ return null;
+ }
+
+ public URI loadSVG(URL docRoot)
+ {
+ return loadSVG(docRoot, false);
+ }
+
+ /**
+ * Loads an SVG file and all the files it references from the URL provided.
+ * If a referenced file already exists in the SVG universe, it is not
+ * reloaded.
+ * @param docRoot - URL to the location where this SVG file can be found.
+ * @param forceLoad - if true, ignore cached diagram and reload
+ * @return - The URI that refers to the loaded document
+ */
+ public URI loadSVG(URL docRoot, boolean forceLoad)
+ {
+ try
+ {
+ URI uri = new URI(docRoot.toString());
+ if (loadedDocs.containsKey(uri) && !forceLoad) return uri;
+
+ InputStream is = docRoot.openStream();
+ return loadSVG(uri, new InputStreamReader(is));
+ }
+ catch (Throwable t)
+ {
+ t.printStackTrace();
+ }
+
+ return null;
+ }
+
+
+ public URI loadSVG(InputStream is, String name)
+ {
+ return loadSVG(is, name, false);
+ }
+
+ public URI loadSVG(InputStream is, String name, boolean forceLoad)
+ {
+ return loadSVG(new InputStreamReader(is), name, forceLoad);
+ }
+
+ public URI loadSVG(Reader reader, String name)
+ {
+ return loadSVG(reader, name, false);
+ }
+
+ /**
+ * This routine allows you to create SVG documents from data streams that
+ * may not necessarily have a URL to load from. Since every SVG document
+ * must be identified by a unique URL, Salamander provides a method to
+ * fake this for streams by defining it's own protocol - svgSalamander -
+ * for SVG documents without a formal URL.
+ *
+ * @param reader - A stream containing a valid SVG document
+ * @param name - <p>A unique name for this document. It will be used to
+ * construct a unique URI to refer to this document and perform resolution
+ * with relative URIs within this document.</p>
+ * <p>For example, a name of "/myScene" will produce the URI
+ * svgSalamander:/myScene. "/maps/canada/toronto" will produce
+ * svgSalamander:/maps/canada/toronto. If this second document then
+ * contained the href "../uk/london", it would resolve by default to
+ * svgSalamander:/maps/uk/london. That is, SVG Salamander defines the
+ * URI scheme svgSalamander for it's own internal use and uses it
+ * for uniquely identfying documents loaded by stream.</p>
+ * <p>If you need to link to documents outside of this scheme, you can
+ * either supply full hrefs (eg, href="url(http://www.kitfox.com/index.html)")
+ * or put the xml:base attribute in a tag to change the defaultbase
+ * URIs are resolved against</p>
+ * <p>If a name does not start with the character '/', it will be automatically
+ * prefixed to it.</p>
+ * @param forceLoad - if true, ignore cached diagram and reload
+ *
+ * @return - The URI that refers to the loaded document
+ */
+ public URI loadSVG(Reader reader, String name, boolean forceLoad)
+ {
+//System.err.println(url.toString());
+ //Synthesize URI for this stream
+ URI uri = getStreamBuiltURI(name);
+ if (uri == null) return null;
+ if (loadedDocs.containsKey(uri) && !forceLoad) return uri;
+
+ return loadSVG(uri, reader);
+ }
+
+ /**
+ * Synthesize a URI for an SVGDiagram constructed from a stream.
+ * @param name - Name given the document constructed from a stream.
+ */
+ public URI getStreamBuiltURI(String name)
+ {
+ if (name == null || name.length() == 0) return null;
+
+ if (name.charAt(0) != '/') name = '/' + name;
+
+ try
+ {
+ //Dummy URL for SVG documents built from image streams
+ return new URI(INPUTSTREAM_SCHEME, name, null);
+ }
+ catch (Exception e)
+ {
+ e.printStackTrace();
+ return null;
+ }
+ }
+
+
+ protected URI loadSVG(URI xmlBase, Reader is)
+ {
+ // Use an instance of ourselves as the SAX event handler
+ SVGLoader handler = new SVGLoader(xmlBase, this, verbose);
+
+ //Place this docment in the universe before it is completely loaded
+ // so that the load process can refer to references within it's current
+ // document
+//System.err.println("SVGUniverse: loading dia " + xmlBase);
+ loadedDocs.put(xmlBase, handler.getLoadedDiagram());
+
+ // Use the default (non-validating) parser
+ SAXParserFactory factory = SAXParserFactory.newInstance();
+ factory.setValidating(false);
+ factory.setNamespaceAware(true);
+
+ try
+ {
+ // Parse the input
+ XMLReader reader = XMLReaderFactory.createXMLReader();
+ reader.setEntityResolver(
+ new EntityResolver()
+ {
+ public InputSource resolveEntity(String publicId, String systemId)
+ {
+ //Ignore all DTDs
+ return new InputSource(new ByteArrayInputStream(new byte[0]));
+ }
+ }
+ );
+ reader.setContentHandler(handler);
+ reader.parse(new InputSource(new BufferedReader(is)));
+
+// SAXParser saxParser = factory.newSAXParser();
+// saxParser.parse(new InputSource(new BufferedReader(is)), handler);
+ return xmlBase;
+ }
+ catch (SAXParseException sex)
+ {
+ System.err.println("Error processing " + xmlBase);
+ System.err.println(sex.getMessage());
+
+ loadedDocs.remove(xmlBase);
+ return null;
+ }
+ catch (Throwable t)
+ {
+ t.printStackTrace();
+ }
+
+ return null;
+ }
+
+ public static void main(String argv[])
+ {
+ try
+ {
+ URL url = new URL("svgSalamander", "localhost", -1, "abc.svg",
+ new URLStreamHandler()
+ {
+ protected URLConnection openConnection(URL u)
+ {
+ return null;
+ }
+ }
+ );
+// URL url2 = new URL("svgSalamander", "localhost", -1, "abc.svg");
+
+ //Investigate URI resolution
+ URI uriA, uriB, uriC, uriD, uriE;
+
+ uriA = new URI("svgSalamander", "/names/mySpecialName", null);
+// uriA = new URI("http://www.kitfox.com/salamander");
+// uriA = new URI("svgSalamander://mySpecialName/grape");
+ System.err.println(uriA.toString());
+ System.err.println(uriA.getScheme());
+
+ uriB = uriA.resolve("#begin");
+ System.err.println(uriB.toString());
+
+ uriC = uriA.resolve("tree#boing");
+ System.err.println(uriC.toString());
+
+ uriC = uriA.resolve("../tree#boing");
+ System.err.println(uriC.toString());
+ }
+ catch (Exception e)
+ {
+ e.printStackTrace();
+ }
+ }
+
+ public boolean isVerbose()
+ {
+ return verbose;
+ }
+
+ public void setVerbose(boolean verbose)
+ {
+ this.verbose = verbose;
+ }
+
+ /**
+ * Uses serialization to duplicate this universe.
+ */
+ public SVGUniverse duplicate() throws IOException, ClassNotFoundException
+ {
+ ByteArrayOutputStream bs = new ByteArrayOutputStream();
+ ObjectOutputStream os = new ObjectOutputStream(bs);
+ os.writeObject(this);
+ os.close();
+
+ ByteArrayInputStream bin = new ByteArrayInputStream(bs.toByteArray());
+ ObjectInputStream is = new ObjectInputStream(bin);
+ SVGUniverse universe = (SVGUniverse)is.readObject();
+ is.close();
+
+ return universe;
+ }
+}
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